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Enthalpy of Ionization

1. Homework Statement

Find the enthalpy of ionization of the weak acid, ΔH3

H3O+ + OH- <-> 2H2O.................ΔH1
HA + OH- + H2O <-> A- + 2H2O....ΔH2
HA + H2O <-> H3O+ A-...............ΔH3

3. The Attempt at a Solution

I won't show it here but I've found ΔH1 to be -52.33 kJ/mol and ΔH2 to be -5.21 kJ/mol. I don't know how to get the third enthalpy though, I know you'd use Hess' law but I don't really understand what to do here.
 

Borek

Mentor
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Obviusly you have to start with the second reaction, as it has HA and A- in correct places. Then use the first reaction to get rid of OH- on the LHS and H2O on the RHS.
 

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